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-rw-r--r--library/Icinga/Application/Logger.php349
1 files changed, 349 insertions, 0 deletions
diff --git a/library/Icinga/Application/Logger.php b/library/Icinga/Application/Logger.php
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+<?php
+/* Icinga Web 2 | (c) 2014 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Application;
+
+use Exception;
+use Icinga\Data\ConfigObject;
+use Icinga\Application\Logger\Writer\FileWriter;
+use Icinga\Application\Logger\Writer\SyslogWriter;
+use Icinga\Exception\ConfigurationError;
+use Icinga\Exception\IcingaException;
+use Icinga\Util\Json;
+
+/**
+ * Logger
+ */
+class Logger
+{
+ /**
+ * Debug message
+ */
+ const DEBUG = 1;
+
+ /**
+ * Informational message
+ */
+ const INFO = 2;
+
+ /**
+ * Warning message
+ */
+ const WARNING = 4;
+
+ /**
+ * Error message
+ */
+ const ERROR = 8;
+
+ /**
+ * Log levels
+ *
+ * @var array
+ */
+ public static $levels = array(
+ Logger::DEBUG => 'DEBUG',
+ Logger::INFO => 'INFO',
+ Logger::WARNING => 'WARNING',
+ Logger::ERROR => 'ERROR'
+ );
+
+ /**
+ * This logger's instance
+ *
+ * @var static
+ */
+ protected static $instance;
+
+ /**
+ * Log writer
+ *
+ * @var \Icinga\Application\Logger\LogWriter
+ */
+ protected $writer;
+
+ /**
+ * Maximum level to emit
+ *
+ * @var int
+ */
+ protected $level;
+
+ /**
+ * Error messages to be displayed prior to any other log message
+ *
+ * @var array
+ */
+ protected $configErrors = array();
+
+ /**
+ * Create a new logger object
+ *
+ * @param ConfigObject $config
+ *
+ * @throws ConfigurationError If the logging configuration directive 'log' is missing or if the logging level is
+ * not defined
+ */
+ public function __construct(ConfigObject $config)
+ {
+ if ($config->log === null) {
+ throw new ConfigurationError('Required logging configuration directive \'log\' missing');
+ }
+
+ $this->setLevel($config->get('level', static::ERROR));
+
+ if (strtolower($config->get('log', 'syslog')) !== 'none') {
+ $this->writer = $this->createWriter($config);
+ }
+ }
+
+ /**
+ * Set the logging level to use
+ *
+ * @param mixed $level
+ *
+ * @return $this
+ *
+ * @throws ConfigurationError In case the given level is invalid
+ */
+ public function setLevel($level)
+ {
+ if (is_numeric($level)) {
+ $level = (int) $level;
+ if (! isset(static::$levels[$level])) {
+ throw new ConfigurationError(
+ 'Can\'t set logging level %d. Logging level is invalid. Use one of %s or one of the'
+ . ' Logger\'s constants.',
+ $level,
+ implode(', ', array_keys(static::$levels))
+ );
+ }
+
+ $this->level = $level;
+ } else {
+ $level = strtoupper($level);
+ $levels = array_flip(static::$levels);
+ if (! isset($levels[$level])) {
+ throw new ConfigurationError(
+ 'Can\'t set logging level "%s". Logging level is invalid. Use one of %s.',
+ $level,
+ implode(', ', array_keys($levels))
+ );
+ }
+
+ $this->level = $levels[$level];
+ }
+
+ return $this;
+ }
+
+ /**
+ * Return the logging level being used
+ *
+ * @return int
+ */
+ public function getLevel()
+ {
+ return $this->level;
+ }
+
+ /**
+ * Register the given message as config error
+ *
+ * Config errors are logged every time a log message is being logged.
+ *
+ * @param mixed $arg,... A string, exception or format-string + substitutions
+ *
+ * @return $this
+ */
+ public function registerConfigError()
+ {
+ if (func_num_args() > 0) {
+ $this->configErrors[] = static::formatMessage(func_get_args());
+ }
+
+ return $this;
+ }
+
+ /**
+ * Create a new logger object
+ *
+ * @param ConfigObject $config
+ *
+ * @return static
+ */
+ public static function create(ConfigObject $config)
+ {
+ static::$instance = new static($config);
+ return static::$instance;
+ }
+
+ /**
+ * Create a log writer
+ *
+ * @param ConfigObject $config The configuration to initialize the writer with
+ *
+ * @return \Icinga\Application\Logger\LogWriter The requested log writer
+ * @throws ConfigurationError If the requested writer cannot be found
+ */
+ protected function createWriter(ConfigObject $config)
+ {
+ $class = 'Icinga\\Application\\Logger\\Writer\\' . ucfirst(strtolower($config->log)) . 'Writer';
+ if (! class_exists($class)) {
+ throw new ConfigurationError(
+ 'Cannot find log writer of type "%s"',
+ $config->log
+ );
+ }
+ return new $class($config);
+ }
+
+ /**
+ * Log a message
+ *
+ * @param int $level The logging level
+ * @param string $message The log message
+ */
+ public function log($level, $message)
+ {
+ if ($this->writer !== null && $this->level <= $level) {
+ foreach ($this->configErrors as $error_message) {
+ $this->writer->log(static::ERROR, $error_message);
+ }
+
+ $this->writer->log($level, $message);
+ }
+ }
+
+ /**
+ * Return a string representation of the passed arguments
+ *
+ * This method provides three different processing techniques:
+ * - If the only passed argument is a string it is returned unchanged
+ * - If the only passed argument is an exception it is formatted as follows:
+ * <name> in <file>:<line> with message: <message>[ <- <name> ...]
+ * - If multiple arguments are passed the first is interpreted as format-string
+ * that gets substituted with the remaining ones which can be of any type
+ *
+ * @param array $arguments The arguments to format
+ *
+ * @return string The formatted result
+ */
+ protected static function formatMessage(array $arguments)
+ {
+ if (count($arguments) === 1) {
+ $message = $arguments[0];
+
+ if ($message instanceof Exception) {
+ $messages = array();
+ $error = $message;
+ do {
+ $messages[] = IcingaException::describe($error);
+ } while ($error = $error->getPrevious());
+ $message = implode(' <- ', $messages);
+ }
+
+ return $message;
+ }
+
+ return vsprintf(
+ array_shift($arguments),
+ array_map(
+ function ($a) {
+ return is_string($a) ? $a : ($a instanceof Exception
+ ? IcingaException::describe($a)
+ : Json::encode($a));
+ },
+ $arguments
+ )
+ );
+ }
+
+ /**
+ * Log a message with severity ERROR
+ *
+ * @param mixed $arg,... A string, exception or format-string + substitutions
+ */
+ public static function error()
+ {
+ if (static::$instance !== null && func_num_args() > 0) {
+ static::$instance->log(static::ERROR, static::formatMessage(func_get_args()));
+ }
+ }
+
+ /**
+ * Log a message with severity WARNING
+ *
+ * @param mixed $arg,... A string, exception or format-string + substitutions
+ */
+ public static function warning()
+ {
+ if (static::$instance !== null && func_num_args() > 0) {
+ static::$instance->log(static::WARNING, static::formatMessage(func_get_args()));
+ }
+ }
+
+ /**
+ * Log a message with severity INFO
+ *
+ * @param mixed $arg,... A string, exception or format-string + substitutions
+ */
+ public static function info()
+ {
+ if (static::$instance !== null && func_num_args() > 0) {
+ static::$instance->log(static::INFO, static::formatMessage(func_get_args()));
+ }
+ }
+
+ /**
+ * Log a message with severity DEBUG
+ *
+ * @param mixed $arg,... A string, exception or format-string + substitutions
+ */
+ public static function debug()
+ {
+ if (static::$instance !== null && func_num_args() > 0) {
+ static::$instance->log(static::DEBUG, static::formatMessage(func_get_args()));
+ }
+ }
+
+ /**
+ * Get the log writer to use
+ *
+ * @return \Icinga\Application\Logger\LogWriter
+ */
+ public function getWriter()
+ {
+ return $this->writer;
+ }
+
+ /**
+ * Is the logger writing to Syslog?
+ *
+ * @return bool
+ */
+ public static function writesToSyslog()
+ {
+ return static::$instance && static::$instance->getWriter() instanceof SyslogWriter;
+ }
+
+ /**
+ * Is the logger writing to a file?
+ *
+ * @return bool
+ */
+ public static function writesToFile()
+ {
+ return static::$instance && static::$instance->getWriter() instanceof FileWriter;
+ }
+
+ /**
+ * Get this' instance
+ *
+ * @return static
+ */
+ public static function getInstance()
+ {
+ return static::$instance;
+ }
+}
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